<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        html {
            font-size: 13.33333333vw
        }
        body {
            font-size: .32rem;
        }
        @media (min-width: 560px) {
            html {
                font-size: 54px
            }
        }
        .div {
            width: 1rem;
            height: 1rem;
            background-color:#000
        }
    </style>
</head>
<body>
    <div class="div">
        我是div元素
    </div>
</body>
<script>
    var b = {
        a: 123
    }
    Object.setPrototypeOf(b, null)
    var a = Object.create(b, { b: {value: 33}})
    
</script>
</html>